A dataset provided by the European Space Agency

Proposal ID 055388
Title Detecting Emission from the Missing Baryons Through X-Ray Shadowing
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https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0553880201
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0553880301

DOI https://doi.org/10.5270/esa-zkjtsus
Principal Investigator, PI Prof JOEL BREGMAN
Abstract The majority of the baryons in the present-day universe are missing in thatthey are not in galaxies or as cool intergalactic gas. These baryons are mostlikely diffuse gas at 1E5 - 1E7 K in regions of modest overdensity, and thesuperposition of many such regions produces X-ray emission that accounts forabout 5-20% of the X-ray background in the 0.2-1 keV range. To detect thisemission, we propose to use the shadowing properties of the extended gas in theedge-on galaxy NGC 4244. This gas will absorb some of the background emission,leading to a local minimum in the soft X-ray background (a shadow).
Publications
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2008-11-16T19:34:56Z/2008-11-19T10:10:13Z
Version 17.56_20190403_1200
Mission Description The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
Creator Contact https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published 2009-12-20T00:00:00Z
Keywords "soft xray background", "galaxy ngc 4244", "local minimum", "shadowing properties", "xray background", "NGC 4244", "cool intergalactic gas", "diffuse gas", "background emission", "kev range", "xray shadowing", "1e5 1e7", "modest overdensity"
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Prof JOEL BREGMAN, 2009, 'Detecting Emission from the Missing Baryons Through X-Ray Shadowing', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-zkjtsus